Method of welding.



R. D. THOMSON. METHOD OF WELDING.

APPLICATION FILED MAY 12, 1911.

Patented Nov. 11, 1913.

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ATTORNEYS UNITED STATES PATENT OFFICE.

ROLAND DAVIS THOMSDN, OF S WAMPSCOTT, MASSACHUSETTS, ASSIGNOR TO THOMSONELECTRIC WELDING COMPANY, OF LYNN, MASSACWSETTS, A CORPORATION OFMAssAcnUsn'r'rs.

METHOD OF WELDING.

To all whom it may concern:

Be it known that I, ROLAND D. THoMsoN, a citizen of the United States,and a resident of Swampscott, in the county of Essex and State ofMassachusetts, have invented certain new and useful Improvements inMethods of lVelding, of which the following is a specification.

My invention relates to methods of welding in which a heating electriccurrent and pressure are employed as in the ordinary processes ofelectric welding.

The invention relates more particularly to an improved method of formingan electrically welded joint betweenthe side of one piece and anotherpiece, the latter being joined by its end or any other portion of itssurfaces to form either a T-weld or any other form of electric weld. Inthe case of a T- weld the angle at which the leg of the T is joined mayobviously depart from a rightangle.

The object of my invention is to avoid the necessity of speciallypreparing or forming one of the pieces apart from or preliminarily tothe operation of making the weld.

The invention will-be described with reference to the production of aT-weld or the welding of one piece of stock by a butt-weld at an angleto the side ofanother.

In the accompanying drawings Figure 1 represents the piece to the sideof which another piece is to be Welded in its blank condition. Fig. 2represents the same piece at the first stage of. the prowss forming myinvention. Fig. 3 shows the piece as assembled in proper juxtapositionto the other piece to.

be welded thereto. Fig.4 shows in perspective the pieces as welded toform a T-weld. Fig. 5 illustrates a modification.

In the drawings, A represents the one piece to whose side the otherpiece is to be welded and B the second piece to be welded to the piece Aby a butt T-weld.

In describing my invention I will assume that the welding is a weldingof the end of the piece B to the side of the piece A but my invention isnot confined to an end or buttwelding and may be practised by thewelding of other surfaces of the piece B or piece of any other form tothe piece A.

To produce a welding in accordance with mv invention, the piece A issubjected to heatin electric current localized at the part thereo atwhich the weld is to be formed Specification of Letters Patent.

Application filed May 12, 1911.

Patented Nov. 1 1, 1913.

Serial No. 626,747.-

' and is subjectedto end pressure to upset the same and form a bur orprojection C thereon, which affords a projection by which the currentmay be localized at the point of welding in the subsequent stages of theoperation, according to my invention. This upsetting may be done in anelectric welding machine of any proper character having clamps adaptedto grasp the piece A at opposite sides of and close to the section whichisto be upset, said clamps affording the means for passing currentthrough the section to be heated. These clamps or similar devices forpassing currentthrough the heated section and subjecting the bar orpiece A to the upsetting or end pressure, are indicated merely in dottedoutline at D. The piece B is welded to the piece A by bringing the sameinto engagement with the upset and subjecting the parts to pressureWhile the current is passed from one to the other, in the usual or anydesired Way. 3 shows the parts as arranged or assembled for this stageof the operation, a clamp or electrode for holding part B and subjectingit to pres sure while passing current through it if desired: beingindicated in typical form and in dotted outline at E. The part A isshown in this figure as arranged in the clamps D by which the upsetprojection C is made.

In practising my invention the parts would be assembled with the part Bengaged with the side of the part Aor at such a slightdistance'therefrom that on the application of pressure to the part A theupset or enlargement caused to appear thereon by the pressure throughclamps D would qulckly engage the piece or part B. Upon tlfieapplication then of pressure endwlse to t e the bur at the back may beavoided,

piece A and pressure to the piece B,- tending to engage it with the sideof the While I have so far described tlie piece A as being a singlepiece of stock it is obvious" that it might conslst of two piecesoriginally butted together where the bur or pro ection C is to beformed, so that in efi'ect" a buttweld of the two portions of the iece Acould be made in the operation of orming the T-weld or other Weld,according to my invention. It will he therefore understood that in thesucceeding claim I include by the term piece or piece of stock a\ pieceA whether'formed of one continuous piece originally or' of two pieceswhich are oined together as one piece at the projection, in theoperation of forming the bur or projection. When said piece of-stock Ais so formed of two pieces, it becomes easier to localize the projectionon one side thereof by properly forming the ends thereof where theyabut, as for instance by forming them at an angle to cause them to firstabut on the side Where the projection is to be formed and in themannerindicated in Fig. 5.

What I claim as my invention is:

The herein described me-thod of Welding the end of one piece of stock atan angle to the side of another, consisting in subjecting-the latter toend pressure and heating current to form a welding projection on theside thereof and at the sametime Welding the first-named piece to theother by said welding projection. a

Signed at Lynn in the count of Essex and State of Massachusetts this 6thday of May A. D. 1911.

" ROLAND DAVIS THOMSON.

Witnesses:

1 W. H. Houses,

J. OLSANDER.

